Cat Feline Acromegaly Diagnosis and Management

Feline acromegaly caused by excess growth hormone from a pituitary tumor affects a significant proportion of diabetic cats. Recognition and treatment improve insulin resistance and welfare.

Key Facts

Acromegaly affects an estimated 25-35% of diabetic cats and is caused by a pituitary adenoma secreting IGF-1
Affected cats show insulin resistance making diabetes very difficult to control despite high doses
Physical changes including enlarged head, paws and abdominal organs develop slowly over months
MRI or CT imaging of the pituitary confirms diagnosis showing the underlying tumor
Radiation therapy of the pituitary tumor achieves remission in a significant proportion of treated cats

Welfare Considerations

Undiagnosed acromegaly in diabetic cats causes continued hyperglycemia despite intensive insulin therapy, with associated complications including cataracts, neuropathy and infections. The recognition that apparent insulin resistance may have a treatable pituitary cause transforms the welfare prognosis. Radiation therapy achieves remission in many cats allowing dramatic reduction in insulin requirements and improved quality of life.

What You Can Do

Suspect acromegaly in any diabetic cat requiring unexpectedly high insulin doses without glycemic control
Request IGF-1 measurement as an accessible blood test for acromegaly screening in resistant diabetics
Seek referral for pituitary MRI or CT if IGF-1 is elevated to confirm tumor presence and size
Discuss radiation therapy options with a veterinary oncologist experienced in feline pituitary tumors
Monitor blood glucose response carefully after treatment as insulin requirements may drop dramatically